#include <iostream>
#include <string>
// 用多态的形式实现通讯录

struct TelephoneInfo
{
    std::string name;
    std::string telephone;
};

DArray book;

class Book
{
public:
    virtual void func();
private:
    
};

class List:public Book
{
public:
    void func(DArray &a)
    {

    }
};